Patent · US Active

Proportional pressure control valve comprising a pressure jump in the characteristic p/l curve thereof

US7905249B2 · kind B2 · utility

5Cited by

11References

10Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Karlheinz Mayr · Zell im Wiesental, DE
Thilo Schmidt · Meckenbeuren, DE
Markus Moosmann · Grünkraut, DE

Key dates

Filing date	Mar 2, 2006
Grant date	Mar 15, 2011
Priority date	—
Expiry date	Apr 14, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87217
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An electromagnetic proportional pressure-control valve of a vehicle transmission which includes a magnet part, a hydraulic part and a spring operatively connecting the magnet part to the hydraulic part. The magnet part includes a coil, an armature and an armature bar. The hydraulic part includes first and second closing elements. The first closing element forms a flat seat and the second closing element a ball seat and the closing elements are opened and/or closed via a tappet rod. When no current is applied to the valve, the second closing element is closed and an gap (ü) in the first closing element is larger than one seventh a nominal width (NW) of the valve. The second closure area (A_2) is larger than a circular area having a diameter corresponding to double the gap and the diameter (s) of the tappet rod is smaller than 0.7 times the diameter (b) of the orifice.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.